Icom IC-E90 Service Manual page 17

4-5-3 CPU (Continued)
Pin Port
number name
Outputs the 50 MHz modulation circuit
84 50M control signal.
Low: While 50 MHz is transmitting.
Outputs the CT3 switch (LOGIC unit;
85 CTSEL Q301) control signal.
Low: DTCS/CTCSS is selected.
Outputs the DTCS decorder filter con-
86 DTCS
trol signal.
SEG37– Output segment data to the LCD
88–90
SEG35 (LOGIC unit; DS4, pins 5–7).
Outputs segment data to the LCD
92 SEG34
(LOGIC unit; DS4, pin 8).
SEG33– Output segment data to the LCD
94–96
SEG31 (LOGIC unit; DS4, pins 9–11).
97 CONT1 Output the LCD contrast control sig-
98 CONT0 nals.
SEG28– Output segment data to the LCD
99–127
SEG0 (LOGIC unit; DS4, pins 12–40).
COM3– Output common data to the LCD
128–131
COM0 (LOGIC unit; DS4, pins 1–4).
Outputs the volume IC (AF unit;
138 VOLC
IC251, pin 5) control signal.
139 CTCOUT Outputs CTCSS/DTCS signals.
Output beep, DTMF tone, 1750 Hz
141 BEEP
tone sounds.
144 WXALT Input port for the WX alert signal.
Description
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